Warp stop mechanism for looms



C. D. BROWN WARP STOP MECHANISM FOR LOQIVIS APPLICATION FILED MAY 27, 1920.

1,362,670, Patented De0. 21,1920.

lnvenTo-r. (30H D. Brown b MWkW ATTyS.

UNITED STATES) PATENT OFFICE.

CARL D. BROWN, OF HOPEDALE, MASSACHUSETTS, ASSIGNOR TO DRAPER CORPORA- TION, 0F HOPEDALE, MASSACHUSETTS, A CORPORATION OF MAINE.

WARP STOP MECHANISM FOR LOOMS.

Specification of Letterslatent.

Patented Dec. 21, 1920.

Application filed May 27, 1920. Serial No. 384,715.

T 0 all whom it may concern:

Be it known that I, CARL D. BROWN, a citizen of the United States, and resident of Hopedale, county of Worcester, State of Massachusetts, have invented an Improvement in Warp Stop Mechanisms for Looms, of which the following description, in connection with the accompanying drawing, is a specification, like characters on the drawing representing like parts.

This invention relates to improvements in warp stop mechanisms for looms of the general type disclosed in United States Letters Patent No. 885,130, granted April 21, 1908, to George B. Ambler, in which the shipper knock-off mechanism is actuated by the con tact of a bunter upon the lay with a dog which is vibrated by a governor across the path of the lay under the control of a normally vibrating feeler which is adapted to be arrested by engagement of a detector released by the breaking of a warp thread.

The principal object of the invention is to provide an improved and simplified mechanism for actuating the knock-off.

A further object of the invention is to provide a knock-off actuating mechanism which can be readily applied to usual commercial looms, particularly of the type above identified.

Other objects and features of the invention will more fully appear from the following description and the accompanying drawing and will be pointed out in the annexed claims. I

In the drawings:

Figure 1 is a side elevation of a sufiicient portion of a loom to illustrate my invention as applied thereto.

Fig. 2 is an enlarged detail side elevation of the improved mechanism for actuating the knock-oil", and,

Fig. 3 is a plan View of the mechanism illustrated in Fig. 2;

The loom to which the present invention is applied may be of the usual commercial type comprising loom sides 1, a lay 2, carried by swords 3 and actuated through a pitman 4 from a crank shaft 5 which is journaled in suitable bearings in the loom side. The loom is provided with any form of suitable shipreleased by a knock-off, preferably in the form of a bell crank lever 9 which is actuated through the mechanism forming the subject matter of this invention which will hereinafter be more fully described.

The loom is provided with the usual harnesses 10 and 11 which engage the warps 12 and 13 to form the shed, said warps passing over lease rods 14 and 15 carried by a bracket 16 suitably supported upon the loom sides. Usual detectors, supported by the warps 12 and 13 between the lease rods 14 and 15, are mounted upon detector bars 17 and 18 and are adapted to drop when released by a broken warp thread into the path of a vibrating feeler 19 carried by a rock shaft 20 which is mounted in suitable bracket-s 21 carried by the loom sides. The rock shaft20 is vibrated through a yieldably mounted arm 22 which is connected by a link 23 to one end of a lever 24, the other end of which is held by a suitable spring in engagement with a cam 25 upon the usual cam shaft 26.

The rock shaft 20 is also provided with an arm 27 which is connected by an adjustable link 28 with the arm 29 of a rock shaft 30 which is mounted in a bracket 31 secured to the loom side and which has at its end a governor 32 which, through the vibration of the feeler, causes the oscillation of a dog across the path of a hunter 34 which preferably is adjustably mounted upon a bracket 35 which desirably is adjustably secured to the lay. I

The general construction and operation of the mechanism above described may be, and as illustrated herein is, the same in effect as that disclosed in the patent to Ambler above described. In the old construction, however, the dog is pivotally mounted upon one end of a lever which is fulcrumed at its other end upon a stationary stud and intermediate of its ends is connected by a link to the knock-oil, the pivot for the dog being normally held substantially in axial aline- In the improved construction the dog 33 is provided with an elongated slot 36 which embraces the governor shaft 30 so that the dog is capable of a pivotal and sliding -movement-upon said governor shaft. The

. the dog 33, the connectionbeing such that the oscillation of the governor imparts a pivotal movement to the dog while the slot 37 is so constructed as to permit slidingmovement of the dog upon the governor shaft 30.

The knockoff actuating, member 39, which is connected at one end to an arm 40, of the knock-off, is providednat! its other end with a head 41 which has in it an elongated slot 42 which embraces the governor shaft 30 so that the knock-off actuating member 39, like the dog 33, ispivotally and slidably mounted upon the-governor rock shaft. The head 41 of the knock off, actuating member is located adjacent to the dog 33 and is provided with a transverse slot 43 which receives a pin 44 projecting laterally fromthe dog33.

The pin and slot connection between the dog 33,and the head 41 of theknock-ofi. ac tuating member 39, is such as to permit free pivotal movement of the dog 33 under the action of the governor 32, but to transmit sliding movement of the dog to the knockoff. actuating ;member when the dog is engaged and moved longitudinally by the hunter 34 upon the lay.

In warp-stop mechanisms heretofore constructed the end of the dogi33. is usually provided with a V-shaped recess which is adapted to beengaged by the complementary V-shaped end upon the hunter 34. In some instances as when the drop wires are of a different width the action of the detectors is such as to arrest the dogain the position in which the V-shaped notchin the .end of the dog will. not lie directly in the path of the V-shaped end ofsthe hunter. The engagement, therefore, ofnthehunter with one of the walls of the notch in the endof the dog produces a strain upon the mechanism which actuates the dog.

Another feature of the present invention consists in providing the dog with a fiat 3 face. 45which presents a considerable area adapted to. be engaged bythe end of the hunter. 34, flanges 46 and 47 however, being 7 provided at the edgesofthe end of the dog toaprevent possibility of the dog slipping out of engagement with the hunter. The dog will thus cooperate with any width of drop wire.

In the operation of the loom the feeler 19 is vibratedtransversely beneath the (le carries the feeler 19. The normal oscillatory movement of the rock shaft 20 vibrates the arm 27 whiclnhacting' through the link 23, vibrates the arm 29 of the governor rock shaft 30. The governor, therefore, which is fixedly secured to the rock shaft 30 acts through the stud 38 to oscillate the dog across the path of the bunter-34,=the movements being SQulllHlBd that the end of the dog will be depressed below the path of the hunter upon one beat-up, of the lay and raised above "the path of g the bunterqupon the next beat-up.-- Duringthisnormal movement-the stud44upon the dog oscillates; in the slot 43 oftheknock-off actuatingmenr her without imparting any movement thereto.

.If atiany time ene of the detectors is released by thebreakage ofa. warp-thread, it will fall intothepath of the feelerl9iand arrestthe vibration of the feelerandits rock shaft 20, thereby arresting the vibration of the arm 27 and consequentlyithe' arm 29 which actuates the governor shaft '30. This will position the dogin the path of the hunter. WVhen the hunter 34; therefore, during the rearward movement of the lay, engages the end of the dog 33 it will'slidethe same endwise ,upon; ,the rock shaft and through thestud 34 will also act to slide the knock-off actuating member longitudinally,

shaft, other means .may be ,providedfor permitting the pivotal .andsliding movement of the same, and-thatavarious' modifications in construction and arrangementof parts to adapt the inventiontobther types of mechanisms may .be ;made 'vviltllinl the meaning and scope, of the following claims.

Having thus described I my invention, what 1 claim as-new and desireito secure by'Let-i ters Patent, is: I

1. Loom stopping means comprising a hunter carried by the lay, a-pivotalian d slidably mounted dog in gcotiperative :relation with said bunter, an oscillating; governor; means connecting-said governor to said-dog acting normally to OSCTTTHbQnSflld dog out of the path of vsaid bunter,imeansoperable uponv an abnormal functioning -of ithe loom to arrest said governor: to position said dog i in, the path of said hunter. and means operable by-the. sliding movement ofsaidbunter to stop the loom. r

2; Loom stopping means-comprising a hunter carried by thelay, a pivotal and slidably mounted dog in cooperative relation with said bunter, an oscillating governor, means connecting said governor to said dog acting normally to oscillate said dog out of the path of said bunter, a slidably mounted member, means connecting said dog to said member permitting free oscillatory movement of said dog but transmitting the sliding movement of said dog to said member and means operable by the sliding movement of said member to stop the loom.

3. Loom stopping means comprising a bunter carried by the lay, a pivotal and slidably mounted dog in cooperative relation with said bunter, an oscillating governor, means connecting said governor to said dog acting normally to oscillate said dog out of the path of said bunter but to permit sliding movement of said dog, means for arresting said governor to position said dog in the path of said bunter upon breakageof the yarn and means operable by the sliding movement of said dog when engaged by said bunter to stop the loom.

4. In a warp stop mechanism for looms comprising a lay having a bunter, a shipper, a knock-off therefor, a series of detectors maintained in inoperative position by intact Warp threads, a vibrating feeler to engage and be arrested by a released detector; a pivotally and slidably mounted dog, means operable by said vibrating feeler normally to oscillate said dog out of the path of said bunter, but to position said dog in the path of the bunter upon the arrest of said feeler,

and knockoff actuating means having a con nection with said dog permitting free pivotal movement of said dog but transmitting the sliding movement of said dog to said knock-off actuating means when the dog is engaged by said bunter.

In a warp stop mechanism for looms comprising a lay having a bunter, a shipper, a knock-off therefor, a series of detectors maintained in inoperative position by intact warp threads, a vibrating feeler to engage and be arrested by a released detector; a pivotally and slidably mounted dog, a pivotally mounted governor and means for oscillating the same from said vibrating feeler, means connecting said dog to said governor operable by the oscillation of said governor normally to move said dog out of the path of the bunter but to position said dog in the path of the bunter upon arrest of said feeler, and knock-off actuating means having a connection with said dog permitting free pivotal movement of said dog but transmitting the sliding movement of said dog to said knock-off actuating means when said dog is engaged by said bunter.

6. In a warp stop mechanism for looms comprising a lay having a bunter, a shipper, a knock-off therefor, a series of detectors maintained in inoperative position by intact warp threads, a vibrating feeler to engage and be arrested by a released detector, a rock shaft and means for oscillating the same from said vibrating feeler, a governor on said rock shaft, a dog pivotally and slidably mounted on said rock shaft, means connecting said governor to said dog for oscillating said dog across the path of the bunter but permitting longitudinal movement of said dog when engaged by said bunter, an actuator for said knock-off slidably mounted on said rock shaft having a connection to said dog operable to permit free pivotal movement of said dog but to transmit movement to said knock-off actuator when said dog is engaged by said bunter.

7. In a warp stop mechanism for looms comprising a lay having a bunter, a shipper, a knock-off therefor, a series of de tectors maintained in inoperative position by intact warp threads, a vibrating feeler to engage and be arrested by a released detector, a rock shaft and means for oscillating the same from said vibrating feeler, a governor on said rock shaft, a dog pivotall and slidably mounted on said rock sha having a pin and slot connection with said governor operable to transmit the oscillatory movement of said governor to said dog but to permit relative sliding movement be tween said dog and said rock shaft, a knockoff actuator slidably mounted on said rock shaft and a pin and slot connection between said dog and said knockoff actuator permitting free pivotal movement of said do but transmitting sliding movement of said dog to said knock-off actuating means when said dog is engaged by said bunter.

8. In a warp stop mechanism for looms vcomprising a lay having a bunter, a shipper,

a knock-off therefor, a series of detectors maintained in inoperative position by intact warp threads, a vibrating feeler to engage and be arrested by a released detector, a pivotally and slidably mounted dog having a flat bunter engaging face having flanges at its edges to prevent the bunter from slipping off of the dog, means operable by said vibrating feeler normally to oscillate said dog out of the path of said bunter but to position said dog in the path of said bunter upon arrest of said feeler and knockoff actuating means operable by the sliding movement of said dog when engaged by said bunter. v

In testimony whereof I have signed my name to this specification.

CARL D. BROWN. 

